This collection contains images of stones marking the Mason-Dixon Line, including both original and replaced milestones. The location of the stones is sometimes indicated. The emphasis of the collecton is on Milestones 102 and below, or on the portion of the boundary from Washington to Cecil Counties.

This collection contains photographs taken by Dr. Allie L. Trussell of Mason Dixon markers and other Maryland subjects. Some of the pictures show Dr. Trussell and Elsie Marsden. Other Maryland subjects include county line markers, covered bridges, rivers, dams, a ferry, a tobacco farm and market, and rural views including various landmarks. Also views from the Baltimore area such as the Jones Falls Expressway under construction and a streetcar in Towson.